Improvement in hulls of steamboats



w. HAGERTY.

Constructing Boat Hulls.

No. 79,114. Patented June 23, 1868.

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Letters Patent No. 7 9,114, dated June 23, 1868.

IMPROVEMENT IN HU LLS '0]? STEAMBOATS.

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TO ALL WHOM IT MAY'GONCERN:

Be it known that I, WILLIADYHAGERTY, of Monongahela city, in the county of Washington, and State of Pennsylvania, haveiuvented a new and useful Improvement in the Manner of Draughting theTimhers for the Hulls of Steamboats and other vessels and I do hereby declare the following to be afull and exact description thereof, reference being had to the accompanying drawings, and to the letters and figures'of reference marked thereon. e I l The nature of my invention consists in constructing the recess intlie stem of thehull of vessels, (but more particularly those of steamboats,) for the rcceptionof a balancedjruddcr, upon strictly geometrical principles, as hereinafter set forth, whereby I am enabled to work out my timbers in the yard, and put them up in frame without the risk of their being wrong, or the necessity of cutting them to the proper shape after being in place.

' To enable those skilled in the art of naval architecture to construct the hulls of vessels upon my improved method, I willproeeed to describe the manner of its application. i

In the accompanying drawings- Figure 4 is an end view of a steamboat-hull, one half of, which is p'lanked, and the other'half showing the shape of the timbers. r

Figure 3 is a longitudinal section of a steamboat-hull, showing a balance-rudder in position, and the shape of the recess in the hull to receire it.

Figure 2 is an end skeleton view-of thetimhers, showing the height and length of the curve of each. Figure 1 is a geometrical combined plan and elevation, showing the manner of finding the height and length of thecurves shown in fig, 2, and the rake of the hull and sweep of the-rudder.

In the drawings, A, fig. 1, is the centre line, or a line drawn through the centre ofthe hull fromstem to stern. B, fig. 4, is the skeg or dead-wood. The lines marked 12, 13, &c., figs. 3 and 4, represent the bottom timbers of the hoat, and are shownand marked the same in figs. 3 and 4. O, fig. 1, is the rake of the hull at the centre of'the heat, at the line A, fig. 4-, arid D, fig. 3; is the take at the side of the boat, on the' skeg B3 fig. 4. The outline of the skeg B is shown in fig. 3 by the dotted line n, and the rake upon the slie'g is shownby the dotted line 3. e e", figs. 1 and 3, are hinges or centres, upon which the rudder-swings.

The manner of constructing the diagram shown infig. is as follows: v

First draw the line A indefinitely, and upon it take the point e, which will be the centre, upon which the rudderswings upon the line A from the point 2; set oil the distance from the point a to the transom E, which will vary according to thesize'of the rudder-hinges; and from the transom set oii' upon'theline A the points 14, 13, 12, &c., and erect-indefinite perpendiculars therefrom, and next draw the line C, representing the raise at the centre of the hoat, and whiclris always regulated in accordance with the taste and judgment of the owner or builder. Next draw the line F from'the point e, extending it to the required angle, and at the required length to the'line A, which is. also a matter of taste, and. from it set'oif the line E equal to half the thickness of the I rudder. Now, from the points 0, where the line E cuts the perpendiculars'l i, 13, 12, 850., with e as a centre,

and a radius equal to the distance from the point e to each of the points -0, describe the arcs 7t it, &c., producing them to theline'A at the points ZZ. These lines-show the sweep of the rudder when in its vproper position on the boat. From the points Z Z erect the perpendiculars, dotted lines it, producing them to the centre ral te G. From the points at which theycut the rake, draw the dotted lines at n, rite, parallel to the'line A, extending each one to the perpendiculars numbered lineifrom which the arc starts. For instance, it will be observed that the largest are, it, starts from the points 0. on the perpendicular line 9, and it will also be observed that the dotted line at, which starts at the first where the arc crosses the rake G, is produced uiitil it-fiieets the pcrpendicularline .9, and so with all the other arcs. The intersection of the lines 14, 13, 12,820., will giire the points 2-, through which 'the line D is drawn, and which represents the rake of the hull at the extremity of the rudder-sweep; After drawing the line D through the points of intersection of the lines 14, 13, 12, 850., and the dotted lines at n, 32 0., draw a line at right angles to vthe line D, starting at the point r, and extending itto the line C. This will give the height 'of the curve of each respective timber sh'o\vn\in.fig. 2, hetween the points 11,111, & c., when said timbers are set at right angles to the line D. Twice the distance between the points llupon the line A, and points 0 0 upon the perpendicular lines 14,13, 12, &c., wi1'l be the length'of the curve of the timbers-in fig. 2, each distance being transferred'from fig. 1 to its respective numberediline in fig 2.

Where 'the 'rake begins at the base-'lin'e, there are a. few tifnbers which are set at right angles to the line A in the keel of'the boat. The height ofthe curve of these will be .the distance between the lines G and D,

meaeured 'at rightvangles to the base-line A, fig. 1, and marked q.

The advantages of thy manner of constructing the hulls of steamboat; upongeome'trical principles, so that that I m enabledto make a more perfect fit of the-hull to, the rudderivhen it swings around at=any angle, and

whereby Iain enabled to accomplish the same with a saving of both tinie. andiabor, will be appatent to every boat-builder, and as the description and. drawings will readily be understood vby the intelligent workman, and

believing myself-to be the first'inventor of the above-described method, and having thus described uiy invention,

and the manner of applying it to'use, a

,What I claim, is

Thegeometrical-sy stem or mile as'illnstrated in fig. '1 of the drawings, for dieughting the cross-timbers so as toform a segment of a conoid in the hulls of vessels, substantiallyas set forth and described. l WM: HAGERTY.

Witnesses:

JAMES MclBmim, JAMES J. J'onne't'om 

